You put way more effort getting your awesome dragon sword from an end-game area than that level 30 did.
You don't need awesome dragon sword the 4th to complete the dungeon. Just a level appropriate items.
Not to mention, when you were level 30, you already did all of that work to be geared for that dungeon.
So after you complete dungeons you just stop getting item/weapons? Also, ya you put in the work at lvl 30, and the dungeon gave you lvl 30 items in return as your reward. Now it's giving you lvl 80 items, and it expects you to have worked to be able to earn them.